System and method for ciphering key forwarding and rrc packet deciphering in a umts monitoring system
a monitoring system and key forwarding technology, applied in the field of system and method for monitoring messages in a wireless system, can solve the problems of data packet encryption and deciphering, ck is not available on the same interface, and rrc packets cannot be deciphered
Active Publication Date: 2008-10-02
NETSCOUT SYST TEXAS LLC
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AI Technical Summary
Benefits of technology
[0011]Embodiments of the present invention allow a monitoring system to link a ciphering key captured in one part of the network to encrypted messages captured in a different part of the network. The present invention also allows the monitoring equipment to provide ciphering keys to deciphering applications that are running on the same equipment or different equipment as the monitors that captured the ciphering keys.
Problems solved by technology
One disadvantage of the prior art is that some data packets are encrypted and must be deciphered before they can be analyzed.
However, the CK is not available on the same interfaces that pass the RRC packets.
A second disadvantage of the prior art is that network monitoring equipment may be widely distributed to monitor a UMTS network.
Method used
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Embodiment Construction
[0018]The present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.
[0019]FIG. 1 illustrates a portion of UMTS 100 network comprising Node Bs 101 and Radio Network Controllers (RNCs) 102. Node Bs 101 communicate with RNCs 102 via Iub interfaces 103. RNCs 102 communicate with each other via Iur interface 104. Node B 101 is in communication with User Equipment (UE) 105 via air interface Uu 106. Whenever UEs 105 make or receive a call, signaling messages are exchanged between Node Bs 101 and RNCs 102 over Iub interfaces 103 and, for some calls, between RNCs 102 over Iur interfaces 104. RNCs 102 and Node Bs 101 make up the UTRAN portion of UMTS network 100. UTRAN monitor or probe 107 is coupled to Iub and Iur interfaces 103 and 104 in the UTRAN. UTRAN monitor 107 is non-intr...
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System and method for forwarding a ciphering key to a decipher application comprising capturing a first message carrying the ciphering key from a first network interface, identifying a network node associated with the first network interface, identifying a monitor responsible for processing messages captured from interfaces coupled to the network node, and forwarding the ciphering key to the monitor. In an alternative embodiment, the method may further comprise capturing second messages carrying encrypted messages from a second network interface, and deciphering the second messages using the ciphering key. The method may also comprise identifying user equipment associated with the first messages, and selecting a deciphering application running on the monitor using a user equipment identity.
Description
[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 909,282, filed on Mar. 30, 2007, entitled System and Method for Ciphering Key Forwarding and RRC Packet Deciphering in a UMTS Monitoring System, which application is hereby incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates generally to a system and method for monitoring messages in a wireless system and, more particularly, to a system and method for forwarding ciphering keys captured in a core network to a monitor that is deciphering RRC packets captured in the UTRAN.BACKGROUND[0003]The Universal Mobile Telecommunications System (UMTS) is a third-generation (3G) mobile phone technology standardized first by the European Telecommunications Standards Institute (ETSI) and now by the 3rd Generation Partnership Project (3GPP). UMTS carries both circuit switched (CS) and packet switched (PS) traffic using Wideband Code Division Multiple Access (W-CDMA) as its air interface. T...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H04L9/08H04K1/00H04W12/04H04W24/00
CPCH04W24/00H04W12/04H04L63/30H04W12/037H04W12/72H04W12/75
Inventor HUANG, FANGMINGWANG, BAOYUAN
Owner NETSCOUT SYST TEXAS LLC